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I have a 2002 Merc 225 EFI. I bought it a year ago with under 300 hours. It has around 450 now. The pee stream is very weak, none at idle, a trickle at 4500 rpm. The dash gage says it runs around 200 degrees but the trickle is warm, not hot.

The previous owner gave me the service records and he chased this problem for 4 years, water pumps, sensors, etc. He finally gave up.

I bought a Smartcraft gage. It says the temp rarely goes over 125, and usually runs under 120. The gage also reports 3 psi water pressure at idle and 13 psi water pressure at 4500 rpm which is all in spec but there is still that dribble at the pee hole.

Have you check for and obstruction somewhere inside the water jacket? I also have a 2002 225 EFI Merc on my boat and after replacing the impeller last year, the pee stream is huge. Bigger than on any other outboard I've seen.

I use to have a duck boat with a 90 merc on it that I would run in the Glades and one time I had it suck some mud up and overheat. It was so bad that I had to remove the gear case and clear it out and it never peed the same after that. Until one day I took off the head and there was a ton of crap built up in there blocking the water passage near the pee hole.

You may have something in the hose maybe, you never mentioned pulling the pee hose off inside the cowl and check the flow. Those PSI numbers are fine for a Merc - temp actually is a bit low, should about 140 at idle

Sounds like you have enough water flowing, your issue is the pee stream? keep going - pull it at the block. You apparently have pull a thermostat housing off and have plenty of flow there correct - your PSI is fine. Something is not letting 13 psi into that pee line